Transmission device



Feb. 7, 1928.

V. DAHL TRANSMISSION DEVICE Filed Nov. 6. 1926 2 Sheets-Sheet 1 Nn. ma.

S m A e u :1 Y ,f B e@ NR. V x NN NN f .Il nl Q w r//,.//////...////M//// E ..r \4 L.' Nw RN N mw ww Sw NN Q Patented Feb. l7, 1928.

UNirED STATES via'rlrrr OFFICE.

VALENTINE DAHL, OFOZONELPRK, NEW YORK.

Application filed November This invention relates to transmission devices, and has for an object aspeed changey mechanism in which the gearsare always in mesln thereby making' it unnecessary to disengage theclutch when shifting gears. y

This object may be attained by rotatably n'iounting a plurality ot"gears on the driving shaft, these gears being in mesh Withcoacting gearson the driven shatt andproviding between eachLpair ot gears a sleeveslidably keyed to the shat't. Each sleeve isot lsuch length that in oneposition it is entirely out` of engagement with either gear. Teetlrareprovided on the gears and the sleeveso that i the sleeve may be lockedto the gear byk sliding `it into contact therewithl Wedges are providedbetween the ends ot' each sleeve and the gears for normally maintainingthe sleeve in neutral position. A selector is providedtor moving oneWedge inland the yother out to slide the sleeve into Contact with thegear, thereby locking it to the shaft. Means are also provided to renderthe selector in- Fig. 3 isA an end elevation ot the trans-YV mission; yi,

Fig. 1- i's a section on the` line 4 4' of Fig-hand 7 Y, v

Figs. and 6 are perspective views ot details ot the mechanism.

10 designates the drivingshaftr connected preferably by means of aclutch (not shown) 'to the crank shaft otan automobile engine,

and 11 designates the driven shaft which is connected to the'i'ear axlethrough a ydifterpential or the like.` On the shaft 10 are rotatablymounted gears 12, 13. 14 and lotdifferent sizes and which are in meshwithcoacting gears rigidlv mounted on the, shaftfll.

By selectivelylocking the gears 1213. 14. an d 15. the shaft 111 isdriven from theshaft 10 at diflerent speeds. VTo selectthe proper.,

gear,l sleeves 16 and 17 are slidably keyedfto,

e, i926.- serial Nq. 146359.11.

the sliattl() between thegears 12 `and 13 *andl between thegea-rs 14andql respectively.

"The faces of the sleeves 'and the co-operfy ating' faces ot the gears.are provided with. teeth 1S, by means of which"thesleevefmand" eitherofthe colope'rating, gearsinay be.

lockedy together upon movement of the sleeve4 toward. the gear.

, At opposite sides of thelshaft 10 are arl `r ranged tubular guide`n'ieinbers 19. Mounted for ymovement transversely of the@ guidememberslt) are wedgesf20,"21, 22 and23 respectively-` The inner end ofeach wedge is arranged toV project kbetween afcollarr on the sleeve 16jor 17 andthe gear adjacent the collar, normally toholdtlie teeth 18 outof engagement. The arrangement of each lwedge faceis such. that-inwardmovement.

oifit tendsto torcethe sleeve along the shaft a\ Yay from the gear,adjacent fthe wedge, thereby engaging thensleeve with the other gear otthepa-ir. ated by a Vselector 24 which comprises a ho1- low squaret'ubein theupper and lower walls` of. which fare pivotally vmounted dogs255v `26` and 27`.these dogs being mountedjout of f alignment with eachother. krllhewedges are provided with -squareapertures of, apfp'rnr`imatelvvr the same cross-section ast-he exte- Lrior ot the selectorv 24,vandthelatter isrecessed oppositepthe dogs as at 25?, 26?"` and 27L sothat, when the selector is moved, the

wedges will be operatedfinwardly or out wardly throughcontact withthedogs 25,

26and 27.., The wedges. 2O land'22r are provided with slots 201L and22`through which the dog'.y may pass without operating them.

The wedge 21 is providediwithfy ay slot 21a through which lthe wedge 27may passwithout operating it The dogs are normally.. heldk in projectedposition by a bar v28sarranged within the selector 2-tland beingicapableof movement either with the selector 241. or relative thereto. This baris provided withn'otches 251. 2Gb and' 271 intogwhichithe dogs 25,`2Gand 27may move when the bar 28 is properly positionedwith respect tothe selector 24. 0lllhen thuslpositioned, corresponding movementv of theselector 211 and the bar .28; in the same direction does not; ailgectthe wedgesfQO, '21. 22 andy 23.y TheV Vselectors 24am connectedybyrodsSO with;l the end of'an operating leverll,y and they barsy 2S` or ineutral v selectors are connected These wedges. are operthrough the rods30a with the end of an operating lever 32, the levers 31 and 32 beingpivoted upon a common pivot 33.

The operation of this device is as follows: Assuming the parts are inthe position shown in F ig. 1 with the sleeves 16 and 17 held disengagedfrom the gears by the wedges 20, 21, 22 and 23 and in which positionrotation of the shaft has no effect upon the gears 12, 13, 14 and 15.`To obtain first speed, the lever 31 is moved to the left.V This movesthe selectors 211 and 28 simultaneously tothe right, 28 being movedwiththe right so that its teeth engage the teethv on the gear 13. Poweris now transmitted from the shaft 10 through the sleeve 16, teeth 18,Igear 13, andco-operating gear on the shaft 1l. Second speed is obtainedby moving the selectors further to the right. This brings the dog 27into engagement with the wedge 20, thereby moving it outwardly.

and also brings the dog 26 into engagement v with, the wedge 21, therebymoving it inwardly so that the sleeve 16 is moved to the left `to engageits teeth 18 with the teeth oni-the gear 12. Power is now transmittedfrom the shaft 10 through the sleeve 16, gear 12 and cooperating gear onthe shaft 11. In the meantime, the dog 25 has passed .through the slot22"L without affecting the wedge 22. Further movement of the selectorslto the. right shifts into third speed by bringing the dog 26 intoengagement with theA wedge 22, thereby moving it inwardly, and by alsobringing the dog 25 into engagement with the wedge 23, thereby moving itoutwardly. The sleeve 17 is thus moved to bring the teeth of the sleeve18 and the gear 14 into engagement, thereby locking the gear 141 to theshaft 10. Power is thus transmitted froml the shaft 10 through thesleeve 17 gear 14 and co-operating gear on the shaft 11. At the sametime. the dog 27 passes through the slot 21a without-'changing theposition of the wedge 21. To attain the fourth or high speed, theselectors are moved still further to the right, thus bringing the dog^26 into engagement with'the wedge 23, thereby moving the latterkinwardly and also bringing the dog 27 into engagement with the wedgethereby moving the latter outwardly` the wedges and 21 being unaffected.VThe sleeve 17 is thus mov-ed toward the ,gear 15r to engage the teethon the gear 15 and the sleeve 17 the left.

vselector 28 relative to the selector 24 to bring the notches of h. 26hand 27b into alignment with the dogs 25. 26 and 27. The leve 31 and 32are then simultaneously operated toV slide the selectors 24 and 28 toThe dogs will rotate into the notches when they engage. the wedges, sothat the latter will be unaffectee. lVhen low speed has been reached,the lever 32 is released and it returns to its normal position relativeto 31 .under the influence ofA a suitableyspring, thereby moving 28relative to 24- so that' the dogs are againprojected.

This p arrangement permits changing of speeds without disengaging` theclutch and permits the gears to be continuously in mesh. Moreover, thisarrangement will permit abolishing the clutch if desired, for the wedgesmay be so arranged that in normal position they hold the sleeves 16 and17 away from the gears so that the teeth 18 of the sleeves and gears aredisengaged, thereby permitting rotation of the shaft 10 without rotationof the shaft 1'1. As the sleeves and gears are locked together' at anyspeed selection, the engine Vmay be used as a brake, if desired as, forexample, when going down hill. This is vmade possible by theinterlocking of the teeth 18.

lf desired, one of the gears,for example, 13,-may he operatively relatedto a gear on the shaft 11 through an intermediate pinion, therebyproviding a reversing gear, or, if it is desired to have four speeds inone direction. an additional gear, sleeve and wedges may be provided,for reversely driving the shaft 11 from the shaft 10.

l claim 1. 1n combination, a shaft, gears rotatably mounted thereon,sleeves slid-ably keyed to said shaft, means on said gears and sleevesfor locking one to the other in, one position of the sleeve, wedges forsliding said sleeves on the shaft into locking position, and means forselectively operating the wedges.

2. In combination, a shaft. gears rotatably mounted thereon. sleevesslidably keyed to said shaft, means on said gears and sleeves forlocking one to the other in one position of the sleeve, wedges forsliding said sleeves on the shaft into locking position, said wedgeshaving apertures, slidable member passing lthrough said apertures andprojections on said member to engage said wedges for selectiveoperation.

In combination, a shaft, Ioears rotatably mounted thereon, sleevesslida-bly keyed to said shaft,`means on said gears and sleeves Iii forlocking one to the other' in one position of the sleeve, wedges forsliding said sleeves on the shaft into locking position, saidl `of thesleeve, wedges for sliding said sleeves on the shaft into lockingposition said wedges having apertures, `a slidable member passingthrough said apertures, dogs pivoted to said slidable member, and'meansfor projecting saiddogs into position yto engage said wedges, said meansbeing capable of movement to permit said dogs to assume an inoperativeposition.

In combination, a shaft, gears rotatably mounted thereon, sleevesslidably keyed to said shaft, means on said gears and sleeves forlocking one to the other in one position of the sleeve, wedgesforsliding said sleeves onthe shaft into locking position, said wedgeshaving apertures, a slidable member passing through said apertures, dogspivoted to said slidable member, and means for projecting said dogs intoposition to engage said wedges, said means being capable of movement topermit said dogs to assume an inoperative position, certain of saidwedges having slots to receive said dogs whereby the wedges areselectively operated.

6. In combination, a shaft, gears rotatably mounted thereon,sleevesslidably keyed to said shaft, means on said gears and sleeves:for locking one to the other in one position of the sleeve-wedges forsliding said sleeves on the shaft into locking position, said wedgeshaving apertures, a tubular slidable member passing therethrough, dogspivoted in the wall of said member, and a bar arranged in said memberfor maintaining said dogs in positionto engage said wedges, said barhaving notches to receive said dogs upon relative movement of said barand tubular member.

7. In combination, a shaft, gears rotatably ,mounted thereon, sleevesslidably keyed to said shaft, lmeans on said gears and sleeves forlocking one to the other in oneposition of the sleeve. wedges forsliding said sleeves on the shaft into` locking" position, said wedgeshaving apertures, a tubular slidable member passing therethrough, dogspivoted in the wall of said member, and a bar arranged in said memberfor maintaining said dogs in position to engage said wedges, said barhaving vnotches to receive said dogs upon relative movement of said barand tubular member, certain of said wedges 'having `slots c to receivesaid dogs whereby the wedges are selectively operated.

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8. A selector mechanism comprising ak pluralityl of slides, each slidehaving an aperture, a reciprocal member passing through said apertures,dogs pivoted to sainl reciprocal member and means for projecting said'dogsinto position to engage said slides, said means being vcapableofmovementv to permitsaid `dogs to assume an inoperative position.

- 9; A selector mechanism comprising a plurality of slides, each slidehaving ank aperture, a reciprocal member *passing through saidyapertures, dogs pivoted to said reciprocal member, certain of saidslides having, slots to receive said dogs whereby said slides areselectively operated.

10. A selector mechanism comprising a plurality of slides, each slidehaving an aperture, a tnbularreciprocal member passing through saidaptures, dogs pivoted in the wallY of said reciprocal member and a bararranged in said tubular member for maintaining said dogs in position toengage said slides, said bar having' notches toreceive said dogs uponrelative movement of said bar and tubular member.

11. A selector mechanism comprising a plurality of slides, each slidehaving an aperture, a reciprocal member passing through said apertures,dogs pivoted to said reciprocal member and means for maintaining saiddogs in position to operate said slides.

l2. In combination, af reciprocal tubular member, dogs pivoted in thewall of said member, and a bar slidably arranged in said tubular memberfor maintaining said dogs in projected position, said bar having notchesto receive said dogs upon relative movement of said bar and tubularmember.'y

13.k In coi'nbination, a reciprocil tubular member, dogspivoted 1n thewall of said member, a bar slidably arranged in said tu bular member formaintaining said dogs in projected position, said-bar having notches toreceive said dogs upon relative movement of said bar and tubular member,and means 4for effecting a limited relative movement of VALENTINEnai-IL.

